a) it does matter because despite what you think CeDeFi is only there to create confusion in the industry. Centralized decentralized finance. Which is it?
b) staking has nothing to do with DeFi
b) staking has nothing to do with DeFi
Banks and brokers that offer exposure to the defi market are called CeDeFi because you could interact with DeFi yourself with no restrictions but the organizations that help you are just banks and brokers so it is a centralized company layer on top of the defi market. Those come with restrictions.
Their staking products allow you to provide them with liquidity, similar to a deposit at a bank or certificate of deposit (CD) at a bank, where they take your balance and put it in DeFi products to make a better yield for themselves.